I took the effort and modified the MyPlaces script to support both the Yahoo! and Google Maps APIs. I also fixed a problem with the generator application not working in IE.
I like the idea of having a webpage consume its own microformat - whereas common usage of microformats indirectly benefit the author (through aggregation), with this script I was able to provide immediate benefit to the author for using microformats. Maybe the key to more widespread adoption is to provide more apparent benefit for authors.